31. The pair of holes drilled for roof stitching at internal of
32. If the height of gallery is 1.2 to 1.8m the diameters of the props at thick end.
33. The main purpose of lid is
34. The phenomena of the rocks in immediate roof bend down wards under their own weight and tend to separate from one an other as
35. Barton, choosed six parameter to describe rock mass quality 'Q' four of them connected with joint characteristics and fifth one takes into account i.e stress reduction factor, the sixth parameter is
36. Transformation from wood to anthractie is accompanied by progressive elimination of
37. RMR signifies
38. Pressure drop will be larger at
39. The shear forces, intensity is lowest when the coal and floor beds are
40. Crushing strength of sand stone
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